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Other Non-Current Assets - Summary of Other Non-Current Assets (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥)
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Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |  |  |
Prepayment to acquire a building | [1] | ¥ 404,725 |  | ¥ 404,725
Employee loans | [2] | 32,385 |  |
Rental deposits | [3] | 9,326 |  | 12,772
Others |  | 1,203 |  | 1,203
Total |  | ¥ 447,639 | $ 64,299 | ¥ 418,700
[1] | The amount represented the prepayment for a building (Building D) in Wuhan and the building remained under construction by the real estate developer as of December 31, 2019. RMB200,000 of the prepayment was made through a mortgage loan provided by a PRC bank in November 2018 (Note 12).
[2] | In 2019, the Group approved an employee benefit program under which eligible employees can apply for loans from the Group at prevailing interest rates. Upon maturity, the loans can be repaid by cash or the Company's ordinary shares held by those employees based on prevailing market price at the settlement date.
[3] | The amount represented office and enrollment centers’ rental deposits under the lease contracts, which are not refundable within one year.

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- Definition For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(a)(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 + Details
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